feat: complete rewrite

lib/telegraf-core.module.ts

@@ -0,0 +1,83 @@
+import { Module, DynamicModule, Provider, Type } from '@nestjs/common';
+import {
+  TelegrafModuleOptions,
+  TelegrafModuleAsyncOptions,
+  TelegrafOptionsFactory,
+} from './interfaces';
+import {
+  TELEGRAF_MODULE_OPTIONS,
+  TELEGRAF_PROVIDER,
+} from './telegraf.constants';
+import { TelegrafMetadataAccessor } from './telegraf-metadata.accessor';
+import { TelegrafExplorer } from './telegraf.explorer';
+import { DiscoveryModule } from '@nestjs/core';
+import { TelegrafProvider } from './telegraf.provider';
+
+@Module({
+  imports: [DiscoveryModule],
+  providers: [TelegrafMetadataAccessor, TelegrafExplorer],
+})
+export class TelegrafCoreModule {
+  public static forRoot(options: TelegrafModuleOptions): DynamicModule {
+    return {
+      module: TelegrafCoreModule,
+      providers: [],
+      exports: [],
+    };
+  }
+
+  public static forRootAsync(
+    options: TelegrafModuleAsyncOptions,
+  ): DynamicModule {
+    const telegrafProvider = {
+      provide: TELEGRAF_PROVIDER,
+      useClass: TelegrafProvider,
+      inject: [TELEGRAF_MODULE_OPTIONS],
+    };
+    const asyncProviders = this.createAsyncProviders(options);
+    return {
+      module: TelegrafCoreModule,
+      imports: options.imports,
+      providers: [...asyncProviders, telegrafProvider],
+      exports: [telegrafProvider],
+    };
+  }
+
+  private static createAsyncProviders(
+    options: TelegrafModuleAsyncOptions,
+  ): Provider[] {
+    if (options.useExisting || options.useFactory) {
+      return [this.createAsyncOptionsProvider(options)];
+    }
+    const useClass = options.useClass as Type<TelegrafOptionsFactory>;
+    return [
+      this.createAsyncOptionsProvider(options),
+      {
+        provide: useClass,
+        useClass,
+      },
+    ];
+  }
+
+  private static createAsyncOptionsProvider(
+    options: TelegrafModuleAsyncOptions,
+  ): Provider {
+    if (options.useFactory) {
+      return {
+        provide: TELEGRAF_MODULE_OPTIONS,
+        useFactory: options.useFactory,
+        inject: options.inject || [],
+      };
+    }
+    // `as Type<TelegrafOptionsFactory>` is a workaround for microsoft/TypeScript#31603
+    const inject = [
+      (options.useClass || options.useExisting) as Type<TelegrafOptionsFactory>,
+    ];
+    return {
+      provide: TELEGRAF_MODULE_OPTIONS,
+      useFactory: async (optionsFactory: TelegrafOptionsFactory) =>
+        await optionsFactory.createTelegrafOptions(),
+      inject,
+    };
+  }
+}